Between 9 P.M. and midnight on Saturday, the southern face of the Empire State Building became a giant projection screen filled with images of a snow leopard, a manta ray, and other imperilled land and sea creatures. The event, “Projecting Change: The Empire State Building,” devised by Louie Psihoyos, the executive director of Oceanic Preservation Society, and the filmmaker and photographer Travis Threlkel, was a union of art, activism, and ambitious publicity stunt, designed to call...